Database Objects in Oracle :
1. TABLE: Used to store information & allows manipulation, retrieval & share of information.
( user_tables, user_tab_columns ,TAB )
2. VIEWS & SYNONYMS: Used to manipulate, retrieve & share information. They will not hold data.
( user_views, user_synonyms, CAT )
3. SEQUENCES: Used to generate the numbers automatically.
( user_sequences )
4. INDEX & CLUSTER: Used to improve the performance of Oracle while retrieving or manipulating data.
( user_indexes , user_clusters )
Views:
It is a stored select statement.
It is a virtual or Logical component.
It allows Desc, DML, and Select on it.
It will not hold data.
It is stored permanently in the "User_views" system table.
It can be shared with other users.
DML on view are reflected in Table and DML on Table are reflected in the view.
* It is used to share "Selected Rows and Columns" with other users. It is used for reporting purposes.
*It will Improve performance while manipulating or retrieving data from the Views.
